Cathode ray tube



April 10, 1934. K. ENGEL CATHODE RAY TUBE Filed Sept. 9, 1932 Fig. 2.

Kurt Ewgel,

M His Attorney r O t n V n I Patented Apr. 10, 1934 UNITED STATESCATHODE RAY TUBE Kurt Engel, Koslin, Germany, assignor to GeneralElectric Company, Schenectady, N. Y.

Application September 9, 1932, Serial No. 632,371 In Germany September10, 1931 4 Claims.

My invention relates to cathode ray tubes and more particularly tocathode ray oscillographs.

It is an object of my invention to improve the means for supporting thedeflecting plates in tubes of this kind.

0 very difficult to properly adjust the plates relative to each other.Quite particularly in quan tity production it is very difiicult toarrange the two pairs of deflecting plates in planes normal with respectto one another and in such mannor that all tubes shall have the samecharacteristic.

According to my invention this drawback is avoided by providing a glassannulus to which the deflecting plates are secured by means of holdersto which the leads are electrically connected. Preferably a singleannulus is provided to support all deflecting plates, these plates beingfirst secured to the annulus outside of the bulb and the annulustogether with the plates being then introduced into the bulb.

In the drawing forming part of this specification, an embodiment of myinvention is shown diagrammatically by way of example.

In the drawing Fig. 1 is a front View, partly in section, of a cathoderay tube according to my invention.

Figs. 2 and 3 are sections along the lines AA and BB of Fig. 1,respectively, drawn to a larger scale.

Fig. 4 is a view of an ordinary cathode ray tube containing my improveddeflecting plate structure.

In the drawing, 18 is the bulb of a cathode ray tube or oscillograph. 1is an annulus made of glass or some other suitable insulating material.The annulus is here shown as a circular ring, but may be shapeddifferently if desired. 2, 3, 4, 5 are the deflecting plates secured toholding wires 6, 7, 8, 9, respectively, which are sealed into theglass-annulus 1. By securing the plates to the annulus in this manner itis possible to properly adjust the plates outside of the bulb 18 and tothereafter introduce them together with the annulus into the bulb 18.The annulus is preferably secured within the bulb 18 by connecting theends of the holding wires 6, '7, 8, 9 to the leads 14, 15, 16, 17 bymeans of flexible sleeves 10, 11, 12, 13, respectively. The leads arepreferably sealed in the projections 19, 20, 21, 22 of the tube wallafter the holding wires have been connected to them by means of thesleeves. The flexible sleeves are pushed onto the adjoining ends of theholding wires and the leads and owing to their flexibility makesufiicient contact since only voltages and practically no current istransmitted to the plates. As will be seen from Figs. 2 and 3, the endsof the holding wires inside the glass annulus are bent upwardly and.downwardly in such manner that the pairs of opposite deflecting platesare arranged above and below the annulus, respectively. If desired, theconnection between the leads and the holding wires can be established bymeans of other suitable connecting members.

In Fig. 4, numeral 23 designates a filamentary cathode while the usualanode and fluorescent screen are identified by the reference characters24 and'25 respectively. The remaining elements in this figure have thesame reference characters as in the other figures.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

I claim:

1. A cathode ray tube comprising an envelope containing a cathode, ananode and a plurality of electrostatically deflecting members, saidmembers being secured to a body of insulating material, supports betweensaid body and envelope, said cathode and anode being supportedindependently of said body.

2. A cathode ray tube comprising an envelope containing a cathode, ananode and a plurality of electrostatically deflecting members, saidmembers being secured to and equidistantly spaced about an annulus ofglass and means for supporting said annulus within the envelope, saidcathode and anode being supported independently of the annulus.

3. A cathode ray tube comprising an envelope containing a cathode, ananode and a plurality of electrostatically deflecting plates, saidplates being secured to a body of insulating material, supports betweensaid body and the envelope, each of said supports including a flexiblecoupling.

l. A cathode ray tube comprising an envelope containing a cathode, ananode and a plurality of pairs of electrostatically deflecting platesarranged normal to one another, said plates being secured to a body ofinsulating material, metal rods between said body and the envelope, saidrods constituting leading-in conductors for the respective plates andeach rod including a flexible coupling.

KURT ENGEL.

